Version 15.5 the new Pet System is introduced in metin. With this system we can hatch, evolve and feed new pets. The system is independant from the old pets.
There are so far 6 different pets on the new system:

When you click with the right mouse button on a Egg, a new window will open called "Incubator" where you can chose your pet name.
This will cost you 100.000 yang.
Pet names need to have between 4 and 20 characters.
Pet names are not unique (several pets can have the same name)
If you do not input a name, a default one will be assigned.

To access pet user interface you can press "P" on your keyboard, while pet is active, or you can press the button between the "4" and "F1" shortcuts, in this case 2 buttons will appear, one for the alchemy system and the other to the new Pet User Interface.

Pet skils are unlock on the last stage, the number of skills unlocked is set upon hatching of the egg and can be 1, 2 or 3 skills. The skills can be active or passive.Passive skills are always present and it's effect is displayed on top left corner with an icon.
Active skills are triggered automatically on specific situations, active skills have cooldown.
You can choose the pet skills by reading the wiched Pet Skill Book.
After your pet has learned the skill, a "+" will appear in the skill, to evolve it each skill level will require Yang
Skills can be evolved up to level 20.